What cultural faux pas should I try to avoid making in North Carolina?

We asked people in North Carolina if they could share any humorous cultural blunders they commited. For new expats, keep in mind that these incidents are an inevitable part of expat life. Learning to laugh about them is the key!...

Other Questions:

•  What do I need to know before retiring in North Carolina?
•  How do I meet people in North Carolina?
•  What is life like in North Carolina?
•  Is there a lot of crime in North Carolina?
•  Is there a lot of diversity? Are people in North Carolina accepting of differences?
•  What are the schools in North Carolina like?
•  Is the cost of living in North Carolina high?
•  What advice do you have for expats having a baby in North Carolina?
•  What are healthcare services like in North Carolina?
•  Is the cost of living in North Carolina high?
•  What type of recreational facilities are in North Carolina?
•  What is the weather like in North Carolina?
•  Are there good restaurants in North Carolina?
•  Where will I buy groceries and do other shopping in North Carolina?
•  What are the visa & residency requirements in North Carolina?
•  Are healthcare and health insurance expensive in North Carolina?
•  What do I need to know when buying property in North Carolina?
•  Are foreigners allowed to own property in North Carolina?
•  What appliances are typically included in a rental?